Number of the beast is technically 616 if you go by the oldest account. 616 makes more sense; but when has it ever been about sense with Christians and their numerology?

My number is 4, of course; and a cool sequence is the code, g c a t comme ca: 7/3/1/20. Buncha weirdness with that set in that order.

Then the three,

But if you play with the numbers and the patterns, you can see some shenanigans. Like how 6 was a Jew number, and the Christians adopted the 7 to get one over on them; 7 being the male number of completeness...

I've always found certain infinite series very cool. This one is a favorite:

Take the fractions with 1 in the numerator: 1/1, 1/2, 1/3, 1/4, 1/5, . . .

Square each one . . .

and add them up. That is:

Obviously you can't add all of them, because there's an infinite number. But the further you go, the closer you get to a definite value. That value is approximately 1.644934, which doesn't look particularly interesting, until you find out that it's actually . . .

Pi squared over 6! It's amazing to me how pi gets involved with things that have nothing to do with circles and diameters.